RMC TOKINA 'DOUBLER' 2X TELECONVERTER LENS (PENTAX P/KA MOUNT)

Have been looking at buying one of these.
More advice would be appreciated. Would like to use with FA50F1.4

Regards

Chris

I'm not a big fan of teleconverters, but the 50mm lens is the best lens to use one with. The 50mm f1.7 would be a better choice still though.

Thanks John.
Wondered if you could explain your reason for not being "a big fan"?:

regards

Chris

The more layers of glass you introduce the lower the image quality.

I tried a 2X adaptor on a 300mm lens, the resulting images were VERY poor. That's an extreme example but it's the same for all lenses to some extent.

I'm not a big fan because the quality is invariably very poor.

I have this one, and its the best 2x tc I've tried. All tc's will reduce some IQ, but this one is not too bad. I also got a quantaray 2x tc (which I suppose is the same as the sigma, usual with quantaray) and in terms of sharpness I see no discernible difference except the tokina gives more purple fringing (nothing to bad).